So the example is I have a warehouse inside the factory, which stores all the stuff the factor needs to make everything (e.g. a belt making factory, which builds all types of belts).. I have a single belt feeding that, and all my resources are stopped up so there are, for example, 100 Iron plates, 100 steel plates etc. When you start getting complicated, then you need more than 15 signals. Is this a limitation of the language (i.e. the array can only hold 15 entities) ?